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20 January, 12:39

Which causes the production of vitamin D in humans?

A. ultraviolet rays

B. radio waves

C. gamma rays

D. X-rays

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Answers (2)
  1. 20 January, 14:56
    0
    It's A because there used for tanning
  2. 20 January, 15:27
    0
    B radio waves is the answer
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